Stair.



No. 888,884. PATENTBD MAY 28, 1908. s. GROSSMAN.

STAIR. APPLIOATIQN HLEDNov. 19, 190e.

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SAMUEL GROSSMAN, OF NEW YORK, N. Y.

.STAHL Specification of Letters Patent.

Patented May 2e, 190s.

Application filed November 19, 1906., Serial No. 343,986.

To all whom it may concern:

Be it known that I, SAMUEL GRossMAN, a citizen of the United States, residing in the borough of Manhattan, New York city, county and State of New York, have invented certain new and useful Improvements in Stairs, of which the following is such a full, clear, and exact description as will enable any one skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to improvements in stair construction and it has particular reference to stairs in which the main structure is made of metal while the treads proper are made of different material, such as composition, stone or wood, and the particular objects of the present invention are to provide a construction of stairs in which sheetn metal risers can be employed in conjunction with separate sheet-metal tread-supporting plates, which plates rest upon flanges on the risers being clamped at the forward endI to the said flange on the risers, and thereby sustained in place without the use of bolts or rivets, and so that these separate and independent sheet-metal parts, together form steps in which there is an absence of undesirable openings or perforations of any kind, and when used in conjunction with the slabs of material forming the treads proper, no provision is necessary for sealing or closing any openings through the stair structure, and the complete structure presents an imn perforate or solid appearance, at the same time is of comparatively light weight, though possessing all of the necessary strength for such a structure. Vith these and other objects in view my invention consists in the various novel and peculiar arrangements and combinations of the several different parts of the structure, all as hereinafter fully described and then pointed out in the claims.

I have illustrated my invention in the accompanying drawings, wherein;

Figure 1 is a sectional view of a portion of the stairs constructed -in accordance with my invention, the section being taken vertically and longitudinally of the stairway. Fig. 2 is a perspective view of my improved form of riser, which is shown as detached.

Referring to the drawings in which like numbers of reference designate like parts throughout, l designates a riser made of thin sire d.

sheet metal and substantially on the order of that shown in U. S. Letters Patent No. 829,107, granted to `me August 21st, 1906, for improvements in stairs. This sheet metal riser may be secured at its ends to the respective stringers, S, one of which is indicated in Fig. l or secured to suitable supports thereon such as the angle-iron form of support shown in the said Letters Patent and these risers are securely mounted in vertical position so as to sustain the main weight of the treads.

The lower end of each riser 1 is provided with a forwardly extending fiange 2 upon which rests the back edge of a sheet metal plate 3 the forward edge of which is clamped in a groove 4 formed at the upper edge of the riser l by bending backwardly the upper edge thereof as at 5. These plates 3 are made'of thin sheet metal and are of the same length as the risers, and when placed thereon with the front edges clamped in the grooves on the upper end of the risers, they together with said risers form a substantial stair structure, without the use of bolts or rivets for uniting these two parts and without any open oints or perforations between the two, thus in themselves constituting a closed substantial structure of very light weight and at the same time having all the necessary strength for such a structure. The forward edges of the tread supporting plates 3 may be clamped in the groove 4 at the upper end of its adj a cent riser, before the steps are assembled, or it may be done at the time the steps are put in position, in either case the j oint forms a se cure and closed one, and the bend 5 upon its exterior provides an ornamental bead below the tread 6, which is shown as of considerably greater thickness than either the riser or the tread-supporting plate, and which may be made of stone, composition, or wood, as de- As the upper end of the riser lies over upon the upper surface of the tread-supporting plate 3, it forms a shoulder thereon and in order to make the surface beneath the tread 6, iiush, a quantity of filling or cement 7 is placed upon the upper surface of the treadf supporting plate 3, and this may be used to cement the tread in fixed position, as shown in the drawings.

In cases where the ends of the risers l are made fast to the stringers or suitable supports thereon, the risers thus secured in position will alone serve to support the horizontal plates with the superimposed tread, by

reason of the substantial fiange 2 supporting the back edge of the plate and tread, while the front edge rests upon the upper end of the riser next below.

Having thus described my invention what I olaim and desire to secure by Letters Patent is:

l. In stair construction, the combination of stringers, sheet metal risers eaeh provided at its lower end with a flange 2, and at its upper end with a rearwardly-opening groove 4L, and plates 3 each having its rear edge resting on the flange 2, of the riser next above, and its forward edge clamped in the groove 4, of the riser next below.

2. Stairs comprising the combination of stringers, risers l supported by said stringers and Consisting in sheet metal plates eaoh provided at its lower end `with a forwardly extending supporting-flange 2 and at its upperend with a rearwardly-opening clampinggroove 4 formed by a forward bend 5 in the upper edge of said plate, tread-supporting lates 3 resting with their back edges on the lbwer ange 2, vof one riser and with the front edge thereof clamped in said groove 4 on the next riser below, and treads 6 resting upon said supporting-plates.

3. Stairs Comprising the combination of stringers, risers l supported by said stringers and consisting in sheet metal plates eaeh provided at its lower end with a forwardly extending supporting-flange 2 and at its upper end with a rearwardly-opening clampinggroove 4 formed by a forward bend 5 in the upper edge of said plate, tread-supporting plates 3 resting with their back edges on the lower flange 2 of one riser and with the front edge thereof clamped in said groove 4 on the next riser below, filling material 7 placed upon said supporting-plates flush with the flange on the upper end of said risers, and treads 6 resting on said iiange and filling material.

ln testimony whereof, l have hereunto set my hand in the presence of the two subseribmg wltnesses. 

